@Bruce-R To answer each of your questions:
1/2. The 'FlightPlans' folder should be automatically created the first time you load a flight in the 146 after the V2 update. We became aware after the release of the Version 2 update that this file path is slightly different for users who purchased MSFS on Microsoft Store versus Steam and we will be updating the manual to reflect this in the next update to the 146. In the meantime, we have the following FAQ which has the correct file paths listed for the Microsoft Store and Steam versions of MSFS: https://support.justflight.com/support/solutions/articles/17000139849-uns-1-how-can-i-import-a-flight-plan-from-simbrief-
Once the flight plans have been stored in the correct folder and in an .RTE format, they will automatically appear on the COPY PLT RTE page of the UNS-1.
If you downloaded the 146 Professional Version 2 update in the first hour or so after it was released, there was an issue with the installer that caused an error message to appear when attempting to uninstall the 146 through Apps and Features. This was quickly resolved after a few hours of release so any downloads of the V2 update after that time will not have this error.
If you are experiencing this error, we would recommend downloading the latest version of the 146 Professional (v0.2.0b) from your account on JustFlight.com and then running the installer. Once launched, the installer will provide several options such as 'uninstall' or 'repair'. Selecting the 'uninstall' option will allow you to uninstall the product without an error message, and the next time you install the product you will no longer receive an error message when uninstalling through Apps and Features.
I hope that helps.
Mark - Just Flight